Because all religious people are anti-gay? C'mon, the point of anti-discrimination laws is so you don't make snap judgments about a person based on the attributes of a group they belong to. Your comment is just as bigoted as those who say that a person's sexuality means they can't have a family.
It is not bigotry to assume that someone who self-identifies in a religious group believes the things that the community of that religion identifies as its beliefs. While it is true that not all religious people discriminate against homosexuality, most Western (and particularly Abrahamic) religions disapprove of homosexuality as part of the standard interpretation of their doctrine. Other people cannot be expected to know what exceptions you personally make to the rules of the religion you follow.
